Refractometer



FIG. 1 is a perspective view of a refractometer showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top bottom view; and,

FIG. 7 is a bottom plan view thereof.

FIG. 1 has been drawn on a slightly reduced scale with respect to FIGS. 2-7. 

The ornamental design for a refractometer, as shown and described. 